1991 ACURA NSX service indicator

Side Marker/Turn Signal/Hazard Flasher System
Component Location Index

SRS components are located in this area. Review the SRS component locations, precautions, and procedures in the SRS

section (24) before performing repairs or service.

TURN SIGNAL INDICATOR LIGHTS(In the gauge assembly)
Gauge Assembly, page 23-125 HAZARD WARNING SWITCH
Removal, page 23-220
Test, page 23-221
HEADLIGHT SWITCH
Test, page 23-181
Replacement, page 23-182
TURN SIGNAL/HAZARD RELAY
Input Test, page 23-218

UNDER-DASH FUSE BOX TURN SIGNAL SWITCH

Test, page 23-181

Replacement, page 23-182 TURN SIGNAL CANCEL UNIT

Input Test, page 23-219

SIDE MARKER FLASHER CIRCUIT

(In the integrated control unit)

Input Test, page 23-168 ('94-'96) ('91-'93)ProCarManuals.com

G: DRIVER INFORMATION
ALWAYS WEAR YOUR SEAT BELT
THIS CAR IS EQUIPPED WITH A DRIVER AIR- BAG AS A SUPPLEMENTAL RESTRAINT SYS-

TEM
(SRS) IT IS DESIGNED TO SUPPLEMENT THE SEAT

BELT.

BEFORE DRIVING READ LABEL INSIDE THE
CONSOLE BOX.
H: SRS UNIT CAUTION CAUTION NO SERVICEABLE PARTS INSIDE.
DO NOT DISASSEMBLE OR TAMPER.DO NOT DROP.
STORE IN A CLEAN, DRY AREA.
I: STEERING COLUMN CAUTION CAUTION
TO AVOID DAMAGING THE SRS CABLE OR REEL,
WHICH COULD MAKE THE SYSTEM INOPERA-
TIVE, REMOVE THE STEERING WHEEL BEFORE REMOVING THE STEERING SHAFT CONNECTOR

BOLT.
J: CONSOLE BOX INFORMATION
DRIVER'S AND PASSENGER'S AIRBAG INFORMA-
TION SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
CAN PROVIDE ADDITIONAL PROTECTION FOR
THE DRIVER AND PASSENGER IN A FRONTAL
COLLISION. A FUNCTIONAL DESCRIPTION OF
THE SRS IS IN YOUR OWNER'S MANUAL.
THE SYSTEM MUST BE INSPECTED TEN YEARS AFTER DATE OF MANUFACTURE, AS
NOTED ON THE CERTIFICATION PLATE.
ANY REPAIR, INSPECTION OR NEARBY AC-
CESSORY INSTALLTION SHOULD BE DONE BY
AN ACURA DEALER. IF YOUR SRS INDICATOR:
(cont'd)
LIGHTS WHILE DRIVING OR FLASHES;
FAILS TO LIGHT OR STAYS ON AFTER THE
IGNITION IS FIRST TURNED ON:
SEE YOUR AUTHORIZED ACURA DEALER.

(SUNVISOR)ProCarManuals.com

Camshafts

Inspection

1. Put the camshafts, the camshaft holders and holder pipes on the cylinder head, and then tighten

the bolts to the specified torque.

NOTE: Apply clean engine oil to 8 mm bolt threads.
Specified torque: 8 mm x 1.25 mm bolts:
22N .
m (2.2 kg-m, 16 Ib-ft)
6 mm x 1.0 mm bolts: 10N .
m (1.0 kg-m, 7 Ib-ft)

CAMSHAFT HOLDER BOLTS TORQUE
SEQNUENCE

FRONT:

REAR:
PLASTIGAGE STRIP
2. Seat the camshaft by pushing it toward left end of
cylinder head.
3. Zero the dial indicator against the left end, then push the camshaft back and forth, and read the end play.Camshaft End Play:
Standard (New): 0.05—0.15 mm

(0.002-0.006
in)

Service Limit: 0.5 mm (0.02 in)
4. Remove the bolts, then remove the camshaft holders from the cylinder head.
Do not rotate the camshaft during inspection.
Remove the rocker arms and rocker shafts.

NOTE:

Lift camshaft out of cylinder head, wipe clean,
then inspect lift ramps. Replace camshaft if lobes
are pitted, scored, or excessively worn. Clean the camshaft bearing surfaces in the
cylinder head, then set camshaft back in place.
Insert plastigage strip across each journal.

5. Install the camshaft holders, and then tighten the

bolts to the specified torque, as shown in the left
column on this page.
6. Remove the camshaft holders and measure widest portion of plastigage on each journal.
Camshaft-to-Holder Oil Clearance:
Standard (New):
0.050-0.089
mm

(0.002-0.004 in)

Service Limit: 0.15 mm (0.006 in)ProCarManuals.com

Troubleshooting

Troubleshooting Guide
NOTE: Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they should be inspected starting with . Find the symptom in the left column, read across to the most likely source, then refer
to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system , etc.
If codes other than those listed above are indicated, count the number of blinks again. If the Malfunction Indicator
Lamp is in fact blinking these codes, substitute a known-good ECM and recheck. If the indication goes away, replace
the original ECM.
If the Malfunction Indicator Lamp is on while the engine is running, jump the service check connector. If no code
is displayed (Malfunction Indicator Lamp stays on steady), the back-up system is in operation.
Substitute a known-good ECM and recheck. If the indication goes away, replace the original ECM.
USA:

Malfunction
Indicator
Lamp (MIL)
CANADA:

Check

Engine

Light

PAGE

SYSTEM

SYMTOM
MALFUNCTION INDICATOR
LAMP"

TURNS ON

MALFUNCTION
INDICATOR LAMP BLINKS
ENGINE WON'T START
DIFFICULT TO START
ENGINE WHEN COLD
WHEN COLDFAST IDLE

OUT OF SPEC

IRREGULAR

IDLING
ROUGH IDLE
WHEN WARM

RPM

TOO HIGH
WHEN WARM
RPM

TOO LOW

WHILE
WARMING UP

FREQUENT

STALLING
AFTER

WARMING UP
MISFIRE OR

ROUGH

RUNNING

POOR
PERFORM-

ANCE
FAILS

EMISSION

TEST

LOSS OF

POWER
ENGINE

CONTROL

MODULE

11-42

HEATED

OXYGEN

SENSOR

11-48, 11-50
MANIFOLD
ABSOLUTE

PRESSURE
SENSOR

11-58
CRANKSHAFT

POSITION/
CYLINDER

POSITION
SENSOR

11-64

PGM-FI

ENGINE

COOLANT

TEMPERA-
TURE

SENSOR
THROTTLE
POSITION
SENSOR
INTAKE AIR
TEMPERA-

TURE

SENSOR
BAROMET-

RIC PRES-
SURE

SENSOR
IGNITION

OUTPUT

SIGNAL
VARIABLE VALVE

TIMING & VALVE

LIFT ELECTRONIC
CONTROL SOLENOID
VALVE

6-15

11-74

11-72
11-70

11-68
11-66
ProCarManuals.com

Troubleshooting
Self-diagnostic Procedures
I. When the Malfunction Indicator Lamp (MIL) has been reported on, do the following: 1. Connect the Service Check Connector terminals with a jumper wire as shown (the Service Check Connector islocated under the dash on the passenger side of the car). Turn the ignition switch ON.
SERVICE CHECK CONNECTOR (2P)

JUMPER
WIRE

2. Note the Diagnostic Trouble Code (DTC): the MIL indicates a code by the length and number of blinks. The MIL
can indicate any number of simultaneous component problems by blinking separate codes, one after another. Codes
1 through 9 are indicated by individual short blinks. Codes 10 through 59 are indicated by a series of long and
short blinks. The number of long blinks equals the first digit, the number of short blinks equals the second digit.
USA:
MALFUNCTION

INDICATOR

LAMP
(MIL) CANADA:

CHECK

ENGINE

LIGHT

See DTC 1

See DTC 3

See DTC 13

See DTC 1 and 3

See DTC 3 and 4

See DTC 3 and 14ProCarManuals.com

Troubleshooting

Self-diagnostic Procedures (cont'd)

If codes other than those listed above are indicated, verify the code. If the code indicated is not listed above, replace

the
ECM.
The Malfunction Indicator Lamp (MIL) may come on, indicating a system problem, when, in fact, there is a poor or
intermittent electrical connection. First, check the electrical connections, clean or repair connections if necessary.
A/T: The MIL and D indicator light may come on simultaneously when the code blinks 6, 7 and 17. Check the PGM-FI
system according to the PGM-FI system troubleshooting, then recheck the D indicator light. If it comes on, see page 14-52.
The MIL and TCS indicator light may come on simultaneously when the code blinks 3, 5, 6, 13, 15, 16, 17, 35 and

36.
Check
the
PGM-FI system according
to the
PGM-FI system
troubleshooting,
then
recheck
the TCS
indicator
light.
If it comes on, see page 19-84.
The MIL does not come on when there is a malfunction in the A/T Fl signal. However, when the two terminals of
the service check connector are connected with a jumper wire, the MIL will indicate the codes.
PAGE

11-42

11-48 11-48

11-58

11-64

11-66

11-68
11-64
11-70
11-145

11-72

11-88
11-74
11-107
11-76

11-78

6-15

6-17

11-80

11-82

11-82

19-100
19-102
11-50
11-50 11-54
11-54
11-56

11-56

11-116
6-15
6-17
11-80
11-64
11-64ProCarManuals.com

PGM-FI System

Troubleshooting Flowchart
Engine Control Module (ECM) (cont'd)
Malfunction Indicator Lamp (MIL) stays on after two seconds.

Turn the ignition switch ON.

Connect the service check con-

nector terminals with a jumper

wire.
Does the MIL indicate
any Diagnostic Trouble

Code (DTC)?

Remove the jumper wire from the
service check connector.
Try to start the engine.Did the engine start?
Remove and inspect the ACG (S) (20 A) fuse in the engine compart-
ment fuse/relay box.
Is the fuse OK?
(To page 11-45) Go to self-diagnostic procedures
(see page 11-34).

Turn the ignition switch OFF.

Connect the test harness between

the ECM and connectors (see page 11-37).

Turn the ignition switch ON.
Measure voltage between C9 (+)

terminal and D22 (-) terminal.

Is there approx. 5V (A/T: 11 V)?
Repair short to body ground in
BLU wire between the ECM (C9),
TCM, EPS control unit, ABS con-
trol unit or TCS control unit and service check connector.
Repair open in BLU wire be-
tween ECM (C9) and service check connector.
Repair open in GRN/WHT wire
between service check con-
nector and ECM (D22).
Replace the fuse.
NOTE: After repair, disconnect the service check con-
nector jumper wire, test drive the car, and recheck the
MIL for a code. NOTE: When there is no code stored, the MIL will stay
on if the service check connector is jumped.
Connect the service
check connector termi-

nals with a jumper wire.

Measure voltage be-

tween C9 (+) terminal

and D22 (-) terminal.

Is there approx. 5 V(A/T:
11 V)?

Remove the jumper
wire from the service
check connector.
(To page 11-45)ProCarManuals.com

Description
Electronic Control System (cont'd)
TRANSMISSION CONTROL MODULE (TCM)

ENGINE
CONTROL
MODULE
(ECM) Shift Control

Lock-up

Control

TCS Control Unit
EPS Control Unit Engine RPM
Air Conditioning Signal Brake Switch Signal
Vehicle Speed Sensor Signal
Mainshaft Speed Sensor Signal
Countershaft Speed Sensor Signal

Self-Diagnosis
Function

Self-Diagnosis Indicator

INTERLOCK
CONTROL UNIT
Lock-up Control Solenoid
Valve B
Lock-up Control Solenoid
Valve A Shift Control Solenoid

Valve B

Shift Control Solenoid
Valve A

Linear Solenoid
Throttle Position
Sensor Signal
Engine Coolant

Temperature
Sensor Signal
Accet Pedal

Angle Signal

Service Check
Connector
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